Conductor flue for furnaces



Aug, 7, 1923.

N. M. HARTZELL.

CONDUCTOR FLUE FOR FURNACES Filed Aug. 23. 1922 TORNEY.

Patented Aug. 7, 1 .923.

NOBLE M. I-IARTZELL, F PHILADELPHIA, PENNSYLVANIA.

- CONDUCTOR FLUE FOR FURNACES.

Application filed August 23, 1922. Serial No. 583,887.

T 0 all whom it may concern:

Be it known that I, NOBLE M. HARTZELL, a citizen of the United States,residing at Philadelphia, in the county of Philadelphiaand State ofPennsylvania, have invented certain new and useful Improvements inConductor Flues for Furnaces, of which the following is a specification.

This invention relates to air conductor 0 fines for hot air furnaces,stoves, and the like, and has for one of its objects to provide a deviceof this character with improved circulating means in compact andinexpensively constructed form.

Another object of the invention is to provide a device of this charactercomprising a furnace including an enclosing shell having a hot airconductor flue leading from its upper part, and a cold air return flueenclosing the hot air conductor flue and leadin into the shell at itslower part.

Vith these and other objects in view the invention consists in certainnovel features of construction as hereinafter shown and described andthen specifically pointed out in the claims, and in the drawingsillustrative of the preferred embodiment of the invention:- I

Figure 1 is a vertical sectional elevation of a conventional pipelesshot air furnace with the improvement applied.

Fig. 2 is a transverse section on the line 22 of Fig. 1 of the improvedconductor flues.

Fig. 3 is an enlarged plan view of the form of floor register employedin connection with the structure shown in Fig. 1.

The improved flue structure is designed to be employed in connectionwith the class to of furnaces known as pipeless, or those in which theheated air is conducted directly through one portion of a register inthe floor or wall of a room and the cooler air conducted back to thefurnace through another L5 part of the same register.

By means of the improved attachment herein shown and described, aportion of the heated air may be conducted from a pipeless furnace toany required distance, for

0 instance to another room or rooms, without interfering with theordinary operation of the furnace. or in other words transforming apipeless furnace into a pipe furnace,

to a limited extent, without changing the construction of the pipelessfurnace.

In Figure 1 a conventional pipeless furnace is shown consisting of anouter shell 10, and an intermediate shell 11, the outer shell convergingat the upper end and connected to the outer part of a register,represented conventionally at 12, while the mediate shell is alsoconverged at the upper part and connected to the register at the inneror central part.

Disposed within the intermediate shell is an inner shell 13 spaced fromthe intermediate shell and converging at the upper part as shown atlt,with the converging portion spaced from the register 12. A plurality ofopenings 15 are shown between the intermediate shell 11 and inner shell18 at their lower ends to provide communication between the spacesbetween the shells. The heater device is represented conventionally at16 and located within the inner shell, and the floor in which theregister is located is represented at 17.

The improved attachment comprises an outer conductor flue 18 connectedat 19 into the outer shell 10, an inner conductor flue 20 within theouter flue and communicating at 21 with the inner shell. 13, and anintermediate flue 22 between the outer and inner flues and communicatingat 28 with the space between the inner and intermediateshells. I

At their outer ends the three flues are upturned and connected to aregister clevice 24: in the floor 17 and located at a distance from themain register 12, for instance in another room or beyond a partitionrepresented conventionally at 25.

The inner flue 20 and the intermediate flue 22 are arranged to contactat one side with each other and with the outer flue, as shown, andunited at their contacting sides by rivets 26 or other fasteningdevices. By this means the three flues are firmly united and sup portedand require no other internal support.

Vhen the fines 18, 20 and are thus ar ranged the register 24 will becorrespondingly arranged, as shown in Fig. 3.

In the ordinary pipeless furnace the heated air rising from combustionmeans passes upwardly through the central portion of the inter heatgenerator and register 12 and the cooler air passes clownwardly throughthe outer register into the space between the outer and intermediateshells and thence through the openings 15- into the space within theinner shell and thence out through the inner portion of the register 12,and thus establishing and maintaining a continuous circulation of theair.

In the improved device a portion of the heated air passes out throughthe inner flue into the room through the inner portion of the register24, and the cooler air passes down through the outer portion of theregister and into the outer flue 18 and thence into the space betweenthe outer shell 10 and the intermediate shell 11, and thence through theopening 15 into contact with the thence out through the inner flue 20into the room again, with which the register .214: communicates, thuscreating and maintaining a continuous circulation in the latter room.

A portion of the cooler air also passes upwardly through the spacebetween the shells 11 and 13 and thence through the intermediate flue 22and out through the intermediate part of the, register 24, thusprotecting the main hot air flue from the cooler air passing downthrough the outer flue 18. The air flowing through the space between theshells 11 and 13 and thence through the intermediate flue 18 is coolerthan the air flowing out through the main flue 20, hence forms aprotecting cooler cushion to the inner flue as above noted.

The improved device is simple in construction, can be readily applied toa 'pipeless furnace without changing the furnace except formingperforations through the shells to receive the flues, and thus transformthe ordinary pipeless furnace into a pipe furnace, but withoutinterfering with the ordinary operation of the pipeless furnace.

A suitable damper device,representedconventionally at 32, willpreferably be located in the outer part of the'inner shell 13, as shownin Fig. 1.

The preferred embodiment of the invention is disclosed in the drawingsand setforth in the specificatiombut it will be understood thatmodifications within the scope of the claimed invention may be made inthe construction without departing from the principle of the inventionor sacrificing any of its advantages.

Having thus described the inventiomwhat is claimed as new is 1. In ahotv air furnace comprising an outer shell and an interi'nediate shellcommunicating with a room, an inner shell terminating below the upperline of the intermediate shell and spaced therefrom, an outer flueleading from the outer shell, an inner flue leading from the inner shelland enclosed by the outer hue, and an intermediate flue leading from thespace between the inter-- mediate and inner shells and extending betweenthe inner and Outer flues, and provid ing an envelope which protects theinner flue from the cooler air passing through the outer flue.

2. A hot air furnace comprising an outer,

shell and an intermediate shell communicating with a room, below theupper line of the intermediate shell and spaced therefrom, an outer flueleading from the outer shell, an inner flue leading from the inner shelland enclosed by the outer flue, an intermediate flue leading from thespace between the intermediate and inner shells and ner and outerflue-s, said flues being in contact at one side, and fastening meansextending through the flues where they contact.

In testimonyithereof, I affix my signature hereto.

NOBLE M. HARTZELL.

an inner shell terminating extending between the in

